How to reset anaconda root environment

See https://github.com/conda/conda/issues/1032

This has been implemented as conda list --revisions and conda install --rev REV_NUM.

EDIT: be careful though if you execute conda install --rev 0 as this will remove your root environment and the conda command. Maybe conda install --rev 1 would produce the desired behavior (restore root environment to its state after first installation).

EDIT 2018-03-07: Use the --revision argument instead of --rev

Not exactly what you are asking but I found conda clean -all useful to clean out a bunch of old packages, logs etc. which somewhat restores conda to a new state.